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Earnings Per Share - Reconciliation of Basic and Diluted Earnings Per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 29, 2015	Mar. 30, 2014
Earnings Per Share [Abstract]
Net Earnings	$ 3.7us-gaap_NetIncomeLoss	$ 2.5us-gaap_NetIncomeLoss
Less: Earnings allocated to participating securities	(0.1)kelya_ParticipatingSecuritiesDistributedandUndistributedEarningsLossBasicandDiluted	(0.1)kelya_ParticipatingSecuritiesDistributedandUndistributedEarningsLossBasicandDiluted
Net Earnings available to common shareholders	$ 3.6kelya_NetEarningsAvailableToCommonShareholders	$ 2.4kelya_NetEarningsAvailableToCommonShareholders
Basic earnings per share on common stock (in dollars per share)	$ 0.10us-gaap_EarningsPerShareBasic	$ 0.07us-gaap_EarningsPerShareBasic
Diluted earnings per share on common stock (in dollars per share)	$ 0.10us-gaap_EarningsPerShareDiluted	$ 0.07us-gaap_EarningsPerShareDiluted
Average common shares outstanding (millions):
Basic (in shares)	37.7us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	37.4us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (in shares)	37.8us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	37.4us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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- Definition

Net earnings after earnings distributed and allocated to participating securities under the two-class method.

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Amount of earnings (loss) distributed and earnings (loss) allocated to participating securities for the basic and diluted earnings (loss) per share or per unit calculation under the two-class method.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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